How to Farm Core Crystals Quickly (Xenoblade Chronicles 2)

Requires you to reach Chapter 4, if you have not reached this far, please stop reading as there might be spoilers.

Reach Empire of Mor Adain, Anangham #2 Dock

Buy 99 NORMAL CYLINDERS

Unengage any blade that has Salvage Mastery Field Skill

Go to the dock salvage point

FAIL MISERABLY at the QTE, although the results of the salvage don’t seem to care much, this is just for convenience

You are looking for a monster called Tolden Krabble and looks like a small hermit crab, this monster drops a guaranteed Common Core Crystal upon death.

Charge up your chain attack gauge on any other monster (the Zamtrios or the Stingray)

Kill the hermit crab using an overkill of 200% bonus or more in Chain Attack

The hermit crab will drop a guaranteed rare core.

Notes:

Time of day don’t matter, sea cloud level don’t matter

Done with 167 Luck but I doubt it matters, I have always gotten a common core from death and a rare from overkill Chain

Doesn’t seem to be any diminishing returns, I’m at 91 Cylinders spent and this is my haul: https://imgur.com/NsDj5CV.jpg while failing miserably at the chain attacks and managing the gauge, thus losing a lot of opportunities.

In fact the last few attempts were done correctly and I got a rare from each, meaning no matter how many you kill it won’t stop dropping.